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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

210577 puzzles downloaded.

2 14       4     15     12 16      
  13   10             11 7        
      3   13                    
11 1     16     15 9 13       2    
            1 16           9 15  
3 9               12 14 4 11 5   16
8   5       4 12 3 15   11 1   7  
15       3 14   9   5 1          
          1 16   12   7 5       11
  3   11 15   5 13 16 2       10   12
7   1 15 2 12 8               16 14
  16 10           1 4            
    14       3 7 8     15     4 10
                    16   6      
        14 2             15   12  
      12 6     11     3       5 1
Showing puzzle number: 340
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Super easy (0)
Solution methods: SiSo
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